I believe that irex shuts itself down from standby if there is less than some percentage of charge left... so the battery will not be completely empty unless one is going on vacation for a couple of years. Self-discharge of Li-Ion batteries is negligible.
Anyway, one will face such problems with any type of Li-Ion based device. If Li-Ion battery is self-discharged to a "completely empty" level and a bit deeper, it will die, because battery controller will have no power to work (and, particularly, charge the cells).
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